OLED

oled

OLED stands for Organic Light Emitting Diode. The ‘organic’ in OLED refers to organic material. Carbon is the basis of all organic matter. Examples of carbon-based substances include sugar, wood and the majority of plastics. ‘Light Emitting Diode’ describes the process of converting electric energy into light. OLEDs are used in television screens, computer monitors, mobile phones, watches, advertising, information and indication; they can also be used in light sources for general space illumination and in large-area light-emitting elements. An OLED display functions without a backlight. Thus, it can display deep black levels and can be thinner and lighter than liquid crystal displays and more power efficient. Similarly, in low ambient light conditions such as dark rooms, an OLED screen can achieve a higher contrast ratio than an LCD screen using either cold cathode fluorescent lamps or the more recently developed LED backlight. It can also be made up to 85% transparent and printed on flexible substrates.

The layer of organic material is sandwiched between two conductors (an anode and a cathode), which in turn are sandwiched between a glass top plate (seal) and a glass bottom plate (substrate). When electric Current is applied to the two conductors, a bright, electroluminescent light is produced directly from the organic material. OLED has more control over color expression than LCD because it only expresses pure colors when an electric Current stimulates the relevant Pixels. There are two main families of OLEDs. Those based upon small molecules, and more recently, those employing polymers.

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